fixed not-e

diff --git a/helm/software/matita/library/didactic/support/natural_deduction.ma b/helm/software/matita/library/didactic/support/natural_deduction.ma
index 3e7c54d5cbbd6873921b72b9fc6060a6f774ac43..b7ee07cb6da8135c294a57e32a1c9275826383c4 100644 (file)
--- a/helm/software/matita/library/didactic/support/natural_deduction.ma
+++ b/helm/software/matita/library/didactic/support/natural_deduction.ma
@@ -450,7 +450,7 @@ interpretation "Not_elim_ok_2" 'Not_elim_ok_2 ab a b =
 notation > "¬_'e' term 90 ab term 90 a" with precedence 19
 for @{ 'Not_elim (show $ab ?) (show $a ?) }.
 interpretation "Not_elim KO" 'Not_elim ab a = 
-  (cast _ _ (Not_elim _ (cast _ _ ab) (cast _ _ a))).
+  (cast _ _ (Not_elim unit (cast _ _ ab) (cast _ _ a))).
 interpretation "Not_elim OK" 'Not_elim ab a = 
   (Not_elim _ ab a).